find-peak-element

Find Peak Element

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findPeakElement

A peak element is an element that is strictly greater than its neighbors.

Given a 0-indexed integer array <code>nums</code>, find a peak element, and return its index. If the array contains multiple peaks, return the index to any of the peaks.

You may imagine that <code>nums[-1] = nums[n] = -&infin;</code>. In other words, an element is always considered to be strictly greater than a neighbor that is outside the array.

You must write an algorithm that runs in <code>O(log n)</code> time.

&nbsp;
Example 1:

<pre>
Input: nums = [1,2,3,1]
Output: 2
Explanation: 3 is a peak element and your function should return the index number 2.</pre>

Example 2:

<pre>
Input: nums = [1,2,1,3,5,6,4]
Output: 5
Explanation: Your function can return either index number 1 where the peak element is 2, or index number 5 where the peak element is 6.</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= nums.length &lt;= 1000</code></li>
	<li><code>-231 &lt;= nums[i] &lt;= 231 - 1</code></li>
	<li><code>nums[i] != nums[i + 1]</code> for all valid <code>i</code>.</li>
</ul>

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